Yeah lifting can never hurt in the off season... I play in college and we just finished up our fall season, we had 2 weeks off and now were lifting 4 days a week with a specific program, and it is recommended that we long toss at least 3 times a week. We start practicing again in Mid January to get ready for the spring. It is good to stay in shape in the off season so you are ready for the season, and ahead of everyone else. So it seems like you are on the right path.